Device for cutting endless bands of artificial fibers



Jan. 3, 1939.

K. LOHMANN DEVICE FOR CUTTING ENDLESS BANDS OF ARTIFICIAL FiBERS FiledNOV. 20, 1934 Afforneys Patented Jan. 3, 1939 UNITED STATES PATENTOFFICE DEVICE FOR CUTTING ENDLESS BANDS OF Karl Berlin-Treptow, Germany,assignor to I. G. Farbenindnstrie- Aktiengesellsehaft,H-ankfort-on-the-Main, Germany Application November 20, 1934, Serial No.753,962 In Germany November 21, 1933 1 Claim. (01. 111-1) My presentinvention relates to cutting endless bands of. artificial fibers.

One of its objects is an improved process of producing a sliver of cutartificial fibers. Another object is a cutting device for producing thesliver of cut artificial fibers. Further objects will be .seen from thedetailed specification following hereafter. Reference is made to theaccompany s drawing in which Fig. 1 is aside view of the apparatus, Fig.2 is a plan of the apparatus shown in Fig. 3 shows'a development of thesurface of the cutting roller, which illustrates the i8 ment of thecutting blades. v

By means of this new cutting device it is possible to obtain a sliverwhich between the cutting and the drawing out device still retains agood union and after leaving the drawing out de- 90 vice ischaracterized by a particularly good union of the individual fibers.

Freshly produced bands consisting of endless parallel artificial fibershave been dry-crimped in direct sequence to their manufacture or afterarrangetheproductionofaspinninghanlrinasingleoperationandhavethenbeencuttostaples, that isto say,intolengthsofasiseaccordingtorquirement and drawn to produce a new band; the bandof fibers is subdivided by cuts which 30 extend over the whole breadthof the band. Artificial fiber bands have been cut by means of arotatingknife roller which also makes the cut co-extensive with the breadth ofthe band.

The present invention relates to the produc- 85 tion of aband of cutartificialfibers, having an essentially improved union of the fibers, bysubdividing the hitherto usual complete cut into partial cuts, which areso distributedcnthebandofendlessartificialfibersto 40 be cutthat' thesliver is subdivided by the cuts in such a manner that it is impossiblefor an uncut endless fiber to pass through the cutting device.

The invention consists in a rotary cutter having cutting blades incompound at. 4 'lhebladesmaybearrangedonthecylindrical surface of theroller in such a manner that either the whole sliver is subdivided intopieces of equal length or into pieces of periodically recurring lengths.This is attained in the first case .by a uniform arrangement of theblades and in the 8 second case by an irregular arrangement of theblades on the cylindrical surface. This cutting roller has a doublefunction. It servesas a roller for feeding the band and also as acutting roller. For these two functions it is necessary that the 10surface between the blades should consist of rubher or the like. As acounter-support for the cutting roller there may be used either a rollerhaving an elastic surface or, a table having an elastic cover. It isessential that the support should move at the peripheral speed of thecutting roller.

In Fig. 1 the band 1 to be cut passes between the feed rollers 2, 3 andis then subjected to the cutting operation between the cutting roller. Icarrying the knives i and the elastic coating 8.

The supporting roller is shown at I. The'band is then engaged by a pairof draft rollers- I and drawn through the drawing out device Qln theformof a gill box with single set of fallers bymeansofasecond'pairofdraftrollers ll.

Fig.2 showsaplanviewot thatpartofthe device below theilber band I.

Fig. 3 shows an arrangement of cutting blades on the cutting rolleraccording to this invention.

What I claim is:

In a device for cutting to static lengths endless bundles of rayonfibers without the application of any considerable tension. incombination a cutting roller having a surface made of resilient materialcarrying a series of blades, said blades being so arranged in staggeredrelation as to cover the whole breadth of said cutting roller,

a supporting means having a resilient surface pressing said endlessrayon bundle against said cutting roller, said supporting means beingmoved at a speed identical with the peripheral speed oi said cuttingroller.

mam-101mm.

